Ocean-based excursions are the focus of Wild Hawaii Ocean Adventures (WHOA) which utilizes an Ocean Warrior 11-meter Navy assault vessel. Visitors are able to travel to secluded sites, take fast boat rides, have marine encounters, and even go snorkeling.

Founded in 2010, the Kona Diving Company presents its clients with 8 types of services, including in here an introductory dive and private charters. The gear and the accessories can be rented from their shop.

An all ages charter boat and snorkel tour focused on dolphins and manta rays, Coral Reef Snorkel Adventures provides lunch and snacks, and all necessary gear for a guided group excursion to swim with marine animals.

Reef snorkeling can be done using the services of Sea Quest Snorkel Tours. There are three types of packages available: Expedition South Kona, the Deluxe Morning Adventure, and the Captain Cook Express.

Dolphin Discoveries guides snorkelling excursions to Kealakakua Bay, Cook's Monument, and the Place of Refuge, as well as hosting dolphin swims and whale watching expeditions to view Humpbacks in season, or year-round Pilot, Beaked or Melon-headed whale sightings.